JPH06332517A - Cad/cam device - Google Patents

Abstract

PURPOSE:To shorten the machining time of a work by generating a pattern of the path which shortens the machining time. CONSTITUTION:A CAD/CAM device 100 is provided with a machining process defining part 13 which designates a protruding extent of a tool for machining over the curve that shows a machining range in the tool diameter direction, a machining path designating part 14 which designates an original line for generation of a machining path out of the curves, and a machining path generating part 15 which extends the designated curve by the protruding extent designated by the part 13 and also successively offsetting the curves at the eliminating side to generate a machining path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CAD / CAM apparatus, and more specifically, an efficient machining route (hereinafter referred to as "pass") in die machining or lot machining.
And a CAD / CAM device for generating

[0002]

2. Description of the Related Art FIG. 7 is a schematic block diagram of a conventional CAD / CAM device. This CAD / CAM device 700 has a central processing unit (hereinafter referred to as “CPU”) 701.
An input device 2 for inputting input data and command data to the CPU 701; a display device 3 for graphically displaying graphic data, shape data and paths based on the calculation result of the CPU 701; and calculation program data and calculation result of the CPU 701. Storage device 4 for storing and display device 3
And an output device 5 for outputting the content displayed on the screen by a printing device or the like.

The CPU 701 has a central processing unit 11 for performing a control calculation process for the entire apparatus, a curve defining unit 12 for defining a curve for generating a work removal shape, and an allowance in the Z-axis direction for this curve. , A roughing process, a finishing process, and a machining process definition unit 713 that defines a tool cutting amount, a feed speed, and the like, and a machining process generation unit 715 that generates a path based on these machining processes.

FIG. 8 is a flow chart showing a processing procedure of the CAD / CAM device 700. The work W has a shape in which one part is a wall and the other part is open (hereinafter referred to as “open area shape”).
Say. ), It will be processed by a normal pocket processing pass.

In step 81, as shown in FIG. 9, the protrusion amount H of the tool in the coordinates t0, t1, t2 and the radial direction.
Therefore, the end point coordinates t1 of the graphic elements forming the curve C0a
Calculate 0, t11, t12. Then, these coordinates t10, t11, t12, a command for making the graphic element between t3 and t4 an arc, and the radius r0 of this arc are input from the input device 2 to the curve defining unit 12 to define the curve C0a. .

At step 82, as shown in FIG.
The removal shape V2a, a command for generating the corresponding machining step Kla, and a command for designating the machining range of the curve C0a are input from the input device 2. At the same time, the removal shape V
2, the upper surface height Z0 and the lower surface height Z1, the finishing allowances Cr and Cz in the radial direction and the Z axis direction, and the cutting depth Pr of the tool
And Pz, feed rates Fr and Fz, and tool rotation speed S
And the pattern name Pt of the "swirl" path. As described above, in the machining process definition unit 713,
The removal shape V2 and the processing step K1a are defined.

In step 5, a path generation command is input to the path generation unit 715. Then, in step 8,
The pass generation unit 715 generates a pass Pa from the removed shape V2 and the processing step K1a. First, the path curve C0
Offset a to generate path P0a. The offset amount at this time is the finish allowance Cr + the tool radius Tr. Next, the path P0a is offset to generate the path P1a. The offset amount at this time is the radial cutting amount Pr.
Is. Similarly, the paths P2a to P4a are generated.
Furthermore, the path P that connects at one corner of the paths P0a to P4a
11a to P15a are generated. The paths P0a to P4
a, paths P11a to P15a from the inside of the removal shape V2 to the outside of paths P15a, P4a, P14a, P3
a, P13a, P2a, P12a, P1a, P11a,
Connection is made in order of P0a, and a path Pa (see FIG. 11) is generated.

[0008]

The above conventional CAD / C
In the AM device, even when processing the open region shape, the processing is performed by a normal pocket processing pass. Therefore, as shown in FIG. 11, the pattern of the path Pa becomes “spiral”.

However, for example, a part of the outermost path P0a is out of the working range and the tool feed rate cannot be increased by that much, so that a wasteful time is required. Further, in the paths P11a to P15a, the paths P0a to P4a are
Since the cutting depth of the tool becomes larger than that, the feed rate of the tool must be reduced. Also, since it is necessary to use a drill and an end mill for pocket machining,
The number of processing steps increases. From the above, there is a problem that the processing time is long and the efficiency is low.

Further, Japanese Patent Laid-Open No. 62-120505 discloses processing of an open region shape, but does not mention the above problems.

Therefore, an object of the present invention is to provide a CAD / CAM device capable of generating a pass pattern capable of shortening the processing time.

[0012]

According to a first aspect of the present invention, in the CAD / CAM apparatus for generating a path based on a defined removal shape, the present invention is more effective than a line indicating a machining range in the tool radial direction. Machining process definition means for designating the amount of protrusion for processing by protruding the tool, pass line designating means for designating the line from which the path is generated from the line, and the designated line for the amount of protrusion. Just extend
CAD / Circulating means for producing a path by sequentially offsetting the line to the removal side.
A CAM device is provided.

In a second aspect, the present invention provides the above CA.
In the D / CAM apparatus, the machining step definition means includes a feed speed control means capable of specifying the feed speed of the pick path independently of other feed speeds.
/ CAM device is provided.

[0014]

In the CAD / CAM device of the present invention, the amount of protrusion of the tool from the line indicating the machining range in the tool radial direction is specified. Then, the line from which the path is generated is designated from the line. The line thus designated is extended by the amount of protrusion, and the line is sequentially offset to the removal side to generate a path. For this reason, since "parallel" machining can be performed, the distance over which the tool moves outside the machining range is shortened.

Further, if the feed speed of the pick path is designated independently of the other feed speeds, for example, if the feed speed of the pick path is designated faster than the other feed speeds, the machining time is shortened accordingly.

[0016]

The present invention will be further described below with reference to the embodiments shown in the drawings. The present invention is not limited to this. FIG. 1 shows a CAD / C according to an embodiment of the present invention.
It is a schematic block diagram of an AM apparatus. The CAD / CAM device 100 includes a CPU 1, an input device 2 for inputting input data and command data to the CPU 1, a display device 3 for graphically displaying graphic data, shape data, and a path based on a calculation result of the CPU 1. It comprises a storage device 4 for storing the calculation program data and the calculation result of the CPU 1, and an output device 5 for outputting the content displayed on the display device 3 by a printing device or the like.

The CPU 1 includes a central processing unit 11 for performing control calculation processing for the entire apparatus, a curve defining unit 12 for defining a curve for generating a removal shape of a work, and an allowance in the Z-axis direction for this curve. , A roughing process, a finishing process, and a machining process definition unit 13 that defines a tool cutting amount, a feed rate, and the like, and a path curve specification unit 14 that specifies a curve from which a path is generated. And a path generator 15 for generating a path.

FIG. 2 is a flowchart of a processing procedure of the CAD / CAM device 100. In step 1, as shown in FIG. 3, coordinates t0, t1, t2, and t3 and t4.
A command to make the figure element between them an arc and the radius r0 of this arc
Are input to the curve defining unit 12 from the input device 2, and the curve C0
Is defined. Next, as shown in FIG. 4, of the graphic elements of the curve C0, the curve defining unit 12 specifies graphic elements e1, e2, and e3 corresponding to the wall portion of the removal shape V1 to define the curve C1. .

In step 2, the machining process definition unit 13
As shown in FIG. 5, a removal shape V1, a command for generating a processing step K1 for the removal shape V1, and a command for setting the curve C0 as a processing range are input. At the same time, the upper surface height Z0 and the lower surface height Z1 of the removed shape V1, the finishing allowances Cr and Cz in the radial direction and the Z axis direction, and the cutting depths Pr and P of the tool
Input z, feed rates Fr and Fz, tool rotation speed S, and pattern name Pt of a path such as "spiral" or "parallel". As described above, the removal shape V1 and the processing step K1 are defined.

In step 3, it is judged whether the removed shape V1 is an open area shape.

In step 4, when it is determined that the shape is an open region, the curve C1 is designated in the path curve designating section 14 as a path curve.

In step 5, a path generation command is issued based on the machining process K1 and the removal shape V2. In step 6, when the path curve is designated, the path curve is offset to generate the path P. In step 7, after extending both ends of the path curve C1, the path curve C1 is offset to generate the path P0. At this time, the extension amount is the protrusion amount H-the tool radius Tr, and the offset amount is the finishing allowance Cr + the tool radius Tr. Next, the path P0 is offset to generate the path P1. The offset amount at this time is
It is the cutting amount Pr in the radial direction. Similarly, the path P2
Generate ~ P9. Further, paths P10 to P18 that connect the paths P0 to P9 at the end points are generated. The path P0
˜P9 and paths P10 to P18 are rearranged in the direction from the outside of the finish shape V1 toward the curve C1 and the paths P9 and P1 are arranged.
8, P8, P17, P7, P16, P6, P15, P
5, P14, P4, P13, P3, P12, P2, P1
1, P1, P10, P0 are connected in this order to generate a path P as shown in FIG.

In step 8, if no path curve is specified, a path is generated according to a path pattern similar to the conventional one.

The CAD / CAM device according to the present invention, which has the above-described structure, can perform "parallel" machining, and the distance that the tool moves out of the machining range can be shortened. The paths P10 to P18 serve as pick paths, and the feed rate of the tool can be increased. Further, since the machining start point is provided outside the work, the cutting amount becomes uniform and the tool feed speed becomes uniform. Also, there is no need to use a drill. As a result, the processing time is shortened.

The feed rate of the pick path is specified independently of other feed rates. As shown in FIG. 5, for example, if the feed speed Fr2 of the pick path is designated to be higher than the other feed speeds Fr, the processing time is shortened accordingly.

[0026]

According to the CAD / CAM device of the present invention, the machining time of the work is shortened. Particularly, it is useful in lot processing.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a CAD / CAM device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure of the CAD / CAM device of FIG.

FIG. 3 is an explanatory diagram showing a path curve defined by a curve defining section in FIG.

FIG. 4 is an explanatory diagram showing a path curve specified by a path curve specifying unit in FIG.

FIG. 5 is an explanatory diagram showing a removal shape and a processing step corresponding to the removal shape.

FIG. 6 is an explanatory diagram showing generated paths.

FIG. 7 is a schematic configuration diagram of a conventional CAD / CAM device.

8 is a flowchart showing a processing procedure of the CAD / CAM device of FIG.

9 is an explanatory diagram showing a path curve defined by a curve definition unit in FIG. 7. FIG.

FIG. 10 is an explanatory diagram showing a removed shape and a processing step corresponding thereto.

FIG. 11 is an explanatory diagram showing generated paths.

[Explanation of symbols]

 100 CAD / CAM device 1 CPU 2 Input device 3 Display device 4 Storage device 5 Output device 11 Central processing unit 12 Curve definition unit 13 Machining process definition unit 14 Path curve designation unit 15 Path generation unit

Claims (2)

[Claims] 1. A CAD / CAM device that generates a machining path based on a defined removal shape, and specifies the protrusion amount for machining by protruding the tool from a line indicating the machining range in the tool radial direction. Machining step defining means, a machining path line designating means for designating a line from which a machining path is generated from the line, the designated line is extended by the protrusion amount, and the line is moved to the removal side. A CAD / CAM device, comprising: a machining path generation unit that sequentially offsets to generate a machining path. 2. The CAD / CAM device according to claim 1, wherein the machining step definition means includes a feed speed control means capable of designating a feed speed of a pick path independently of other feed speeds. Characteristic CAD / CAM device.